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are coronae of late-type stars made of solar-like structures? the x
are coronae of late-type stars made of solar-like structures? the x

The fate of black hole singularities and the parameters of the
The fate of black hole singularities and the parameters of the

... second1 , this may be taken to be the rate at which our ignorance about the universe is increasing due to our not knowing what lies behind all of these event horizons. When one adds quantum physics to the picture the puzzle becomes a crisis, as first realized by Hawking in 1974, because of the probl ...
Description of Pictures In the Dome
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... cultures and traditions. The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the al ...
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... using chromospheric ages of nearby stars (Rocha-Pinto et al., 2000). These data are corrected for different selection biases and are binned into 0.4 Gyr bins. The line and hatched region describe a 1-2-1 average of the histogram of the ages of nearby open clusters using the Loktin et al., 1994, cata ...
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... in astrophysics as they efficiently transform gravitational potential energy into radiation. Accretion disks are seen around stars, but the most extreme disks are seen at the centre of quasars. These orbit black holes with masses of ~106-9 M¯, and radiate up to 1014 L¯, outshining all of the stars i ...
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... Formaldehyde in Absorption: Tracing Molecular Gas in Early-Type Galaxies Early-Type Galaxies (ETGs) have been long-classified as the red, ellipsoidal branch of the classic Hubble tuning fork diagram of galactic structure. In part with this classification, ETGs are thought to be molecular and atomic ...
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... aim is to fit physically meaningful stellar parameters and compare stellar evolution models by developing principled statistical methods that directly incorporate the evolution models via state-of-the-art complex computer models. We focus on developing methods for the analysis of CMDs of the stars i ...
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... try to map the universe and gather information about it, the big difference being of course that astronomy is dependent on remote observations in most of the cases—only the solar system can be explored by means of space travel at the moment. However, astronomers not only try to find out what our uni ...
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... Recent experimental and theoretical developments indicate that angular momentum, local vorticity exist and the arising particle polarization is observable. An initial state construction is presented, in streak by streak, τ, x, y, η coordinates, which reflects these features. ...
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the entire issue as one large (23

... spiral arms preceded the radio-mapping of the spiral arms by more than a year. Morgan suffered a nervous breakdown soon after he announced his discovery, however, and so was prevented from publishing a complete account of his work. As a result of that, and the announcement soon afterward of the firs ...
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Theoretical astronomy

Theoretical astronomy is the use of the analytical models of physics and chemistry to describe astronomical objects and astronomical phenomena.Ptolemy's Almagest, although a brilliant treatise on theoretical astronomy combined with a practical handbook for computation, nevertheless includes many compromises to reconcile discordant observations. Theoretical astronomy is usually assumed to have begun with Johannes Kepler (1571–1630), and Kepler's laws. It is co-equal with observation. The general history of astronomy deals with the history of the descriptive and theoretical astronomy of the Solar System, from the late sixteenth century to the end of the nineteenth century. The major categories of works on the history of modern astronomy include general histories, national and institutional histories, instrumentation, descriptive astronomy, theoretical astronomy, positional astronomy, and astrophysics. Astronomy was early to adopt computational techniques to model stellar and galactic formation and celestial mechanics. From the point of view of theoretical astronomy, not only must the mathematical expression be reasonably accurate but it should preferably exist in a form which is amenable to further mathematical analysis when used in specific problems. Most of theoretical astronomy uses Newtonian theory of gravitation, considering that the effects of general relativity are weak for most celestial objects. The obvious fact is that theoretical astronomy cannot (and does not try) to predict the position, size and temperature of every star in the heavens. Theoretical astronomy by and large has concentrated upon analyzing the apparently complex but periodic motions of celestial objects.
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